I-405 over SR 522 Sammamish R
Fair Condition58 years old56,311 vehicles/day
Location
| State | Washington |
| County | King |
| Location | 8.7 N Jct SR 520 |
| Carries | I-405 |
| Crosses | SR 522 Sammamish R |
| Coordinates | 47.75564, -122.18564 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Box Beam - Multiple |
| Total Length | 1410.1 ft (429.8 m) |
| Max Span | 122.0 ft (37.2 m) |
| Deck Width | 43.0 ft (13.1 m) |
| Deck Area | 5630.4 sq m |
| Main Spans | 13 |
| Year Built | 1968 (reconstructed 1997) |
Traffic
| Avg Daily Traffic | 56,311 (2023) |
| Truck Traffic | 6% |
| Lanes On Bridge | 3 |
| Lanes Under Bridge | 8 |
Inspection & Ownership
| Last Inspection | November 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 0008382B0000000 |